Installing New Roof Over Existing One

Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface.

Installing new roof over existing one.

You need a flat surface to install a new roof over existing shingles. Premade trusses will form the skeleton of your new roof above your old roof. Another reason is curling shingles as you can only install a new layer if the first one is completely flat and level. The installation of metal roofing is often easier and faster than other roof types and because of its simple design and generally large size can actually be installed directly on top of existing roofing materials like asphalt shingles and foam roofing.

Mold rot or other significant damage needs to be taken care of with a full replacement not hidden by new materials. A properly installed layover roof can look and function as well. Installing a new roof over shingles takes less time than tearing off the old roof. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros.

Old shingles can curl over time. Before you reshingle a roof read our step. Installing a new roof over an existing one can only be done if you have shingles because you can only put shingles over shingles. Looks just as good and lasts as long.

Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option. Some roofers install a layer of waterproof shingle underlayment wsu over the existing shingles at the eave end as would be done for a roof laid on bare sheathing. It is not possible to mix materials nor to install a new layer over slate or wood tiles. As long as it s done right and under the right conditions installing new shingles over old ones can last as long and look just as good as a complete re roof.

There s a lot of visible damage. This provides added protection against ice dams. Manufacturers will still warranty the roof for the same amount of time as a re roof as long as it s done by a qualified installer.